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03-23-2009, 10:10 AM | #26 |
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bet she's a real beast... gotta love that under curve area
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03-23-2009, 12:11 PM | #27 |
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Nice work, and choice of mods... A powerband like that saves you some shifts, for sure. Jermaine knows what's up, too!
According to that chart, I had one of the lightest Imprezas ever! 2325lbs for my '94 Std. FWD 5mt. Best mileage evar |
03-23-2009, 01:14 PM | #28 |
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awesome setup. What gearing are you running in the car? Curious which 6-speed gear set and I'm guessing 3.9:1 FD...?
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03-23-2009, 03:16 PM | #29 |
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Correct. We are still using the 3.9:1 FD and the trans is from a 2005 STi (early US gearset).
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03-23-2009, 10:41 PM | #30 | |
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I can barely imagine the power surge when that thing hits boost. Must be amazing. 315 wide Hoosier A6's would complement that powerband nicely. |
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03-24-2009, 02:09 PM | #31 |
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looks good matt and jake! I havent seen the car recently. Last time I saw it, it still had the ej20 with no roll bar and no stoptechs etc.. (basically all of 08). I'll have to make it out to a few autox's this season to see this thing run!
Last edited by kcook; 03-25-2009 at 09:35 PM. |
03-25-2009, 02:52 AM | #32 |
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what effect does increasing/decreasing compression have?
and yes im too lazy to google right now |
03-25-2009, 03:50 AM | #33 |
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How much quicker, would you estimate, does it spool up after going to high compression??
Neat car! |
03-25-2009, 06:33 AM | #34 |
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From looking at the old dyno graph with the same setup (just lower compression) it looks like the spool is 200-300RPM earlier. However, you'll notice that the torque before the spool is also much higher.
Increasing the compression is kind of like having a bit more boost except that it works all the time, not just when the turbo is spooled. The trade-off is compression is less efficient than turbo power. Theoretically, I believe the more you move toward compression, the lower your max HP will be (in a sense) but you will have a broader powerband with more low-end. As you move away from high compression you can run more boost safely, but you will experience more lag especially when you have to switch to a larger turbo. |
03-25-2009, 06:53 AM | #35 |
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Did you take it back to the track with the new found power?
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03-25-2009, 10:16 AM | #36 |
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Not yet. I'll update the thread when we eventually get back to the dragstrip, but it may not be for a few weeks with the upcoming auto-xes.
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03-25-2009, 10:34 AM | #37 |
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it looks laggy to me... correct me if im wrong
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03-25-2009, 11:12 AM | #38 |
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look closely....there is a lighter line that hits ~400tq at 3000rpm.
he said 1 tune was normal and one was made to ramp boost slowly on purpose. Im color blind and i can barely see the lines for the normal tune. |
03-25-2009, 11:49 AM | #39 |
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Im sorry if I missed it some where, but didnt see what size injectors you were using. Im curious what you went with for the E85. Thanks.
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03-25-2009, 12:22 PM | #40 |
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Oh wow... their is a faint red line... i missed that... 400wtq @ 3k is good!
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03-25-2009, 12:50 PM | #41 | |
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Quote:
jake |
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03-25-2009, 01:23 PM | #42 | ||
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On a seperate note; if the boost is the same for both motors, you can really see where the VE takes a nose dive... |
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03-25-2009, 02:01 PM | #43 |
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quick test
http://www.toledo-bend.com/colorblind/Ishihara.asp If you dont see any numbers it means your half a genius like Micah and I. To be a full genius you need to be left handed too. |
03-25-2009, 03:23 PM | #44 |
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I believe the previous tune was ~27psi, and this latest tune with the high compression was about 22psi. The WRX heads are definitely giving us issues in the top end, but at the moment I am more concerned about spool and low-end. I don't want any waiting when exiting a corner.
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03-26-2009, 04:35 AM | #45 | |
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2-300rpm.. cool! thats pretty decent increase. I'm kind of kicking myself for buying standard low comp CP's for my build now, I would have liked to bump it up to 9 or 9.5. |
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03-26-2009, 08:57 AM | #46 |
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I had no idea what to expect from this build. When I was researching on here, everyone seemed scared of getting the compression much higher than 9. It may cause problems for pump gas, but our experiences with E85 so far actually make me wish we would have gone more aggressive with the compression.
We changed our wastegate spring from ~14psi to ~7psi when we put the motor back together. I was expecting the wastegate pressure to be like a stock WRX (with much more low end) and the maximum safe boost to be around 12-15psi. I was just trying to be pessimistic so I wouldn't end up disappointed, but I never thought that we would hit the same HP/TQ that we did on the previous setup. In theory, the maximum attainable HP is probably lower but we have been limited by our injectors since we started using E85. I am more than happy with 360+WHP for auto-x, and I wouldn't mind giving up a little HP to have more low-end. Maybe next winter we will sell our 10.5:1 pistons and get some 11:1 or higher. |
03-26-2009, 09:16 AM | #47 |
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if you had planned to run e85 the whole time, 12:1 and boost would have been a very happy combo. Well, that neighborhood at least.
MC22 engine @ 11.5:1 with 19 psi and no intercooler and its happy on E85. |
03-26-2009, 10:10 AM | #48 |
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I don't plan to tear down this motor again unless it is absolutely neccesary. I don't want to rebuild every winter. If you want to up the compression more than we will build another motor from scratch and just swap it.
jake |
03-31-2009, 12:29 PM | #49 |
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If anyone would care to see this setup in action, I have a video from our latest auto-x. Keep in mind this was on 245 Dunlop Z1 SS tires and using the progressive boost map (the green line on the dyno graph in post #1).
http://www.youtube.com/watch?v=67UiC...e=channel_page |
03-31-2009, 01:12 PM | #50 | |
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^^^I'll have to watch it when I get home
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